add ssop generator and make ssop-28 for CAN chip used by AMSAT LTI

diff --git a/packages/Makefile b/packages/Makefile
index e557c8312b1ea4c697cfa7af4661c171f2c9c2ed..c583e319f22d8162edbe194efd8e0445d6b06c0d 100644 (file)
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -11,6 +11,7 @@ DIRS= \
        te-connectivity 
 
 SOIC= \
+       ssop-28.fp \
        soic-16.fp \
        soic-24.fp
 
@@ -139,6 +140,9 @@ clean: $(CLEANDIRS)
 .gitignore: Makefile
        for i in $@ $(FOOTPRINTS); do echo $$i; done > $@
 
+ssop-28.fp: ssop.5c
+       nickle ssop.5c 28 > $@
+
 soic-16.fp: soic.5c
        nickle soic.5c 16 > $@
 

diff --git a/packages/ssop.5c b/packages/ssop.5c
new file mode 100644 (file)
index 0000000..6ad0559
--- /dev/null
+++ b/packages/ssop.5c
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2017 Bdale Garbee <bdale@gag.com>, GPLv3+
+ */
+
+load "footprint.5c"
+import Footprint;
+
+int total_pad = 28;
+real center_gap = 7.20 - 1.75;
+
+if (dim(argv) > 1)
+       total_pad = string_to_integer(argv[1]);
+if (dim(argv) > 2)
+       center_gap = string_to_real(argv[2]);
+
+real pad_width = 0.45;
+
+real pad_height = 1.75;
+
+real pad_spacing = 0.65;
+
+int num_pad = total_pad / 2;   /* per side */
+
+string name = sprintf ("SSOP-%d", total_pad);
+
+real package_width = (num_pad - 1) * pad_spacing + 1.75;
+
+real package_height = center_gap - 0.15;
+
+real pad_y_off = center_gap / 2 + pad_height / 2;
+
+element_start(name);
+
+real pad_off(int n) {
+       return pad_spacing * (n - (num_pad - 1) / 2);
+}
+
+real corner(int dx, int dy) {
+       real    x = dx * package_width / 2;
+       real    y = dy * package_height / 2;
+       real    len = 0.4;
+
+       line(x, y, x - dx * len, y);
+       line(x, y, x, y - dy * len);
+}
+
+corner(-1, -1);
+corner(1, -1);
+corner(-1, 1);
+corner(1, 1);
+
+real dot_off = -.3;
+
+line(-package_width/2 + dot_off, package_height/2 - dot_off,
+     -package_width/2 + dot_off, package_height/2 - dot_off);
+
+for (int pad = 0; pad < num_pad; pad++) {
+       /* bottom (1-num_pad) */
+
+       pad_mm(pad_off(pad),
+              pad_y_off,
+              pad_width,
+              pad_height,
+              sprintf("%d", pad + 1),
+              sprintf("%d", pad + 1));
+       
+       /* top side (total_pad - num_pad+1) */
+
+       pad_mm(pad_off(pad),
+              -pad_y_off,
+              pad_width,
+              pad_height,
+              sprintf("%d", total_pad - pad),
+              sprintf("%d", total_pad - pad));
+       
+}
+
+element_end();